Off the top of my head I can only think of Ford and Edison.
J. Paul Getty?
Rockefeller, Carnegie.
David Sarnoff, Stephen Bechtel, Alfred Sloan, Walter Chrysler, Henry Kaiser,
George Westinghouse
Standard Oil
Krupps
Railroads and steel mills.
J.P. Morgan
Was John-Jacob Astor earlier?
–Cliffy
Wells Fargo, Western Union
J. P. Morgan was a financier, not an industrialist.
It sounds like the OP wants the names of individuals, not companies, so railroads, steel mills and Standard Oil don’t apply.
Re: Chrysler, I was told once on a tour of New York that the Chrysler building is the only skyscraper built without a mortgage. Is this true, and if so does it mean they paid cash for it? That’s what I call an industrial giant, if so.
Gumburg the Filthy, Schnächlzenner the Man-Eater, and the Sxótléax Brothers, who were on the Board of Directors of Standard Oil are some notable industrial giants. Interesting factoid, Dügur Beerbrawler once used some shady dealings to drive down the stock price of a small investment firm, and then literally used the certificates to wallpaper his house on Gray Hill where the Faerie Children don’t play.
Would Andrew Carnegie and Henry Clay Frick count, even though they got their start in the 19th century?
This site says that the Woolworth Building, built 1910-1913, was paid for in cash. The Woolworth was the tallest building in the world until the Manhattan Company and Chrysler buildings were completed in 1930. (Click on the red dots.)
I wonder if it was the tour or my memory that’s faulty. 
Anyway, isn’t that amazing?
Nicola Tesla. He developed pretty much everything to do with electrical power generation and distribution. And a whole shitload more.